薄荷水质量控制方法的研究

目的 完善薄荷水的质量控制方法。方法 采用薄层色谱法鉴别薄荷水中的薄荷素油,用气相色谱法测定薄荷水中薄荷脑的含量。结果 薄层色谱法鉴别专属性强;气相色谱法中,薄荷脑线性范围为5.0~80.0μg/ml(r=0.999 9),平均回收率为103.16%,RSD为1.81%。结论 该法操作简便,结果准确,灵敏度高,重复性好,可有效地控制薄荷水的质量。     

Development and validation of a high-performance thin layer chromatography method for the determination of cholesterol concentration

An accurate, sensitive, precise, reliable, and quick method for the determination of cholesterol content by high-performance thin layer chromatography is developed. In this method, aluminum-backed precoated silica gel 60 F₂₅₄ plates were used as the stationary phase and the samples were sprayed with the help of CAMAG sample applicator Linomat 5. The chromatogram was developed with the mobile phase consisting of chloroform:methanol (9.5:0.5, v/v). The samples were detected using CAMAG Scanner 4 and evaluated using the method developed on winCATS software. Densitometric analysis of cholesterol was performed in absorbance mode at 200 nm. In this solvent system, cholesterol gave a compact spot with an R_f value of 0.63 ± 0.03. The linear regression analysis of data for the calibration curve showed good linearity over a concentration range of 2–7 μg/spot with a regression value of 0.99933 and standard deviation of 1.44%. The limit of detection and limit of quantification were found to be 100 ng/spot and 500 ng/spot, respectively. Using the developed method, the concentration of cholesterol in the saponified and unsaponified egg yolk sample was determined. This method was found to be reproducible and can even be used for samples containing complex matrices.     

Ultrastructural Defects of the Glomerular Basement Membranes Associated with Primary Glomerular Nephropathies

It is generally accepted that a glomerular basement membrane (GBM) thinner than 200?nm should be considered below normal. When this abnormality has a global and diffuse distribution, the associated clinical condition is a benign familial hematuria related to mutations of the COL4A4/COL4A3 genes, or an Alport syndrome. More often the GBM defects display a focal and segmental pattern, too small to express a thin glomerular basement membrane disease. The aim of this study is to emphasize statistical data concerning the pathogenic link between the renal glomerular diseases and the preexisting thin and very thin GBM. A series of 487 renal biopsies from adult patients has been thoroughly investigated both for nephropathologic diagnosis and the GBM ultrastructure. It has been statistically concluded that there is a close coexistence of primary glomerulonephritis and thin glomerular basement membranes with the role of a predisposing condition for immune complex deposition.     

Decontamination Strategies for Creutzfeldt-Jakob Disease Agent

Abstract

A polymethylmethacrylate technique that permits processing of enucleated eye globes with intact bone and tissue is described. The process includes decalcification in 5% formic acid, 22 hr dehydration in ascending alcohols, and 4hr clearing with xylenes to facilitate sectioning.

The combination of established techniques, decalcification agent, and plastic embedment decreases artifact and damage to ocular tissue and avoids lengthy celloidin procedures. (The J Histotechnol 15:311, 1992)     

The evolution of the nosology of osteogenesis imperfecta

Osteogenesis imperfecta (OI) is a relatively common genetic skeletal disorder with an estimated frequency of 1 in 20 000 worldwide. The manifestations are diverse and although individually rare, the several different forms contribute to the production of a significant number of affected individuals with considerable morbidity and mortality. During the last decade, there have been extensive molecular investigations into the etiology of OI and these advances have direct relevance to the medical management of the disorder, and the purpose of this review is to document the history and evolution of the nosology of OI. The current nosology, based on molecular concepts, which are crucial in the identification of genotype‐phenotype correlations in persons with OI, is also outlined. The successive revisions of the nosology and classification of OI have highlighted the importance of the nomenclature of the condition in order for it to be recognized by clinicians, scientists and patient advocacy groups. In this way, improved counseling of patients and individualized, tailored therapeutic approaches based on the underlying pathophysiology of the individual's type of OI have been facilitated.     

MAPLE Deposition of Macromolecules

Macromolecules are poised to feature prominently as components in organic electronics, medical implants, drug delivery systems, and sensors. A common theme for the role polymers will play in all of these is as a thin film. In all applications, it is paramount to have precise control over film thickness, structure, morphology, surfaces roughness, etc. Here, matrix‐assisted pulsed laser evaporation (MAPLE) is reviewed as a route to processing polymer and other soft matter thin films with control over the above‐mentioned parameters. After briefly discussing the experimental setup and current proposed mechanism of film formation via MAPLE, the use of MAPLE to process thin films is highlighted for use in various technologies and applications. Future directions and challenges for MAPLE processing of thin films are also discussed.

     

Thin superficial inferior epigastric artery perforator flap for reconstruction of the tongue

The superficial inferior epigastric artery (SIEA) flap is widely used in the repair of large soft tissue defects of the extremities and in breast reconstruction. Because of the high fat content of the abdomen, it has been less used for glossectomy reconstruction. Here we present a series of seven patients who each underwent reconstruction with a thin SIEA flap after resection of the tongue. There were six men and one woman (mean age 48, range 24–66 years). All patients underwent preoperative computed tomographic (CT) angiography, and colour Doppler ultrasound (US) was used to select and map the most suitable SIEA. The flap was raised above the Scarpa's layer while adjusted the plane of dissection according to the specific needs for bulk in each case. All the flaps survived; one flap required a secondary anastomosis because of a venous anastomotic embolus. The size of flap used was 5.0 cm × 6.0 cm - 7.0 cm × 9.0 cm, and the flap was 0.8 cm-1.4 cm thick. The functional outcome was evaluated at 6 - 18 months follow up, when speech and swallowing were both good in all cases. The dissection above the pubic symphysis is an important refinement of the SIEA flap, and we conclude that the thin SIEA flap is a good choice for reconstruction after excision of cancer of the tongue.     

醒脑颗粒质量标准研究

目的完善醒脑颗粒质量标准。方法采用薄层色谱(TLC)法对制剂中的黄芩、冰片、大黄、玄参进行定性鉴别,采用高效液相色谱(HPLC)法测定制剂中黄芩苷、大黄素及大黄酚含量。结果黄芩、冰片、大黄、玄参的TLC特征性斑点清晰,分离度好,专属性强,阴性对照无干扰;黄芩苷、大黄素及大黄酚质量浓度分别在10. 36~82. 88μg/m L(r=0. 999 9)、3. 350~26. 80μg/m L(r=0. 999 9)、3. 354~26. 830μg/m L(r=0. 999 9)范围内与峰面积线性关系良好,平均加样回收率分别为98. 87%,97. 42%,98. 91%,RSD分别为1. 23%,1. 08%,1. 27%(n=6)。结论该方法操作简便、精确度高、结果可靠,可用于醒脑颗粒的质量控制。